Correct the swapped brightness and speed comments

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Measured on an ASRock Intel Arc B580 Steel Legend, which uses this same
packet: holding everything else fixed and stepping data[5] through 0xFF,
0x40 and 0x00 dims the zone progressively and turns it off at zero, while
data[4] does not change brightness.  So data[4] is the effect speed and
data[5] is the brightness, the other way around from what the comments
said.  The bytes written are unchanged, this only fixes the labels.

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